body {
    background-image: url(../img/login.jpg);
    background-repeat: no-repeat;
    background-size: cover; //背景图适应屏幕
}
html {
    height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
}
.index {
    height: 92%;
    background-color: #fff;
    margin: 2% 20px 20px;
    border-radius: 5px;
    overflow: hidden;
    border-bottom: 1rem solid #8ea4f8;
}
.footer {
    margin: 0 auto;
    top: -13px;
    width: 450px;
    text-align: center;
    position: relative;
    height: 5px;
}
.title {
    text-align: center;
    margin: 0 auto;
    top: 10px;
    position: relative;
}
.sidebar{
    width:90%;
    border-color: #FFFFFF;
    height: 80%;
    position: relative;
    top: 20px;
    display: inline-block;
}
.tab{
    font-size:12px;
    height:8%;
    width:175px;
    background: #eeeeee;
    line-height: 50px; /*把line-height高度设置和height一样就可以让字体垂直居中*/
    border-width: 1px 1px 1px 1px;
    border-style: solid;
    border-color: #efefef;
    border-radius:2px 2px 0 0;
    margin-left: 10px;
    display: inline-block;
}
.reorder{
    margin-left:17px;
    content: url(../img/nav-list.png);
    height: 20px;
    line-height: 60px;
    margin-right: 3px;
}
.navto-nav{
    font-size:12px;
    height:10%;
    width:175px;
    background: #fbfbfb;
    line-height: 60px; /*把line-height高度设置和height一样就可以让字体垂直居中*/
    border-width: 0 1px 1px 1px;
    border-style: solid;
    border-color: #efefef;
    margin-left: 10px;
    display: inline-block;
}
.imooc-icon{
    margin-left:20px;
    content: url(../img/editor.png);
    height: 20px;
    float: left;
    margin-top: 10px;
    position: relative;
    right: 3px;
}

.window {
    width:100px;
    border-color: #FFFFFF;
    height: 80%;
    position: relative;
    top: 20px;
    margin: 0 auto;
    background-color: transparent;
}
.action {
    display: flex;
    position: absolute;
    margin-left: 190px;
    width: 95%;
    height: 109.5%;
    top: 0;
    border-radius: 5px;
    overflow: hidden;
    border-color: transparent;
}
.link {
    text-decoration: none;
    font-size: 13px;
    color: black;
    display: block;
    width: 100%;
    height: auto;

}
.link:focus {
    background-color: #8ea4f8;
}
.link{
    user-select: none;
}
/*.link:visited {*/
/*    color: #8ea4f8; !*已访问的链接颜色*!*/
/*}*/
